for port := range ports {
			instances := gc.ps.ServiceEndpointsByPort(svc, port, nil)
			if len(instances) > 0 {
				foundInternal.Insert(fmt.Sprintf("%s:%d", g, port))
				foundInternalIP.InsertAll(svc.GetAddresses(&model.Proxy{Metadata: &model.NodeMetadata{ClusterID: gc.cluster}})...)
				if svc.Attributes.ClusterExternalAddresses.Len() > 0 {
					// Fetch external IPs from all clusters